An SBR, according to the NFA, is any firearm with a buttstock that has a rifled barrel of less than 16", or an overall length of less than 26". The total length is measured with buttstock in the extended position.

Nice sbr's! I did my paperwork on feb 7, already have my pistol lower engraved and a 8.5 novesek 300 blackout barrel. Just waiting on the ok! Im doing a hogue midlenght tube, as i want it smooth. Yhm ss phantom or titanium, cant decide which one i want to use on her yet. I may be turning my wifes ar into a sbr sooon also!